New York, New York--A Surinam horned frog sits on a pumpkin at the Wildlife Conservation Society's Bronx Zoo in this undated photo. Zoo animals are given pumpkins around Halloween for physical and mental "behavioral enrichment," according to the society.

Surinam horned frogs are also known as Pac-Man frogs due to their wide mouths. The primarily nocturnal frogs live among the leaf litter in the Amazon rainforests. They are avid feeders, employing a sit-and-wait ambush on their prey.